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#ifndef TIMER_STATE_HH
#define TIMER_STATE_HH
#include <chrono>
#include <filesystem>
#include <memory>
class TimerState {
public:
virtual ~TimerState() = default;
/**
* Delegate methods must be thread-safe, they will be called on
* a thread owned by TimerState.
*/
class Delegate {
public:
virtual ~Delegate() = default;
virtual void start(
std::chrono::minutes total,
std::chrono::time_point<std::chrono::system_clock> epoch) = 0;
virtual void stop(std::chrono::minutes total) = 0;
virtual void reset() = 0;
virtual void restart() = 0;
protected:
Delegate() = default;
};
/**
* Start timer. If already started nothing happens.
* Method must be called on the same thread as create.
*/
virtual void start() = 0;
/**
* Stop timer. If already stopped nothing happens.
* Method must be called on the same thread as create.
*/
virtual void stop() = 0;
/**
* Clear total if stopped. If started nothing happens.
* Method must be called on the same thread as create.
*/
virtual void reset() = 0;
/**
* Sets up a shared TimerState. state is stored in state_file.
* Note that delegate may be called before method returns.
* Returns nullptr in case of error.
*/
static std::unique_ptr<TimerState> create(std::filesystem::path state_file,
Delegate* delegate);
protected:
TimerState() = default;
TimerState(TimerState const&) = delete;
TimerState& operator=(TimerState const&) = delete;
};
#endif // TIMER_STATE_HH
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